Causes and Classification of Defects in Glass Bottle Can Molding

Forming is an important part of the glass manufacturing process for bottles and cans. The root cause of molding defects comes from many aspects. Therefore, only after fully understanding the characteristics of the molding method can the true cause of the defect be found. Below Glass Bottle Manufacturer will introduce the relevant information about defects in the glass bottle can molding.

First, concept of defect cause and classification

Defects of general nature may be related to the nature of the glass itself, or they may be formed before, during, or during the molding process. Due to similarities between various molding defects, the reasons for their formation may also belong to the same type.

To analyze the defects in the glass manufacturing process, the following two basic principles should be grasped:

1. Causes of defects:

(1) Defects caused by liquid glass; (2) Defects caused by impact; (3) Defects caused by operation; (4) Defects related to the mold.

2. Classification of the cause of defects:

According to the defects caused by manufacturing: (1) thermal defects; (2) cold defects; (3) defects of poor mechanical adjustment.

Classified according to user acceptance criteria: (1) dangerous defects; (2) important defects; (3) general defects.

Second, the source of the defect

1. There are many glass defects in the bottle and glass manufacturing process, and some defects are not within the scope of the operator of the inline bottle making machine, for example, in the production of Round Honey Glass Jar stones or easily torn glass. Class defects. However, most of the defects come from drip feeders or inline bottle making machines. It may be a problem in operation, or it may be a problem in the quality of the machine itself in terms of manufacturing or performance.

Round Honey Glass Jar

2. Various different molding methods require accurate control of the physical properties of glass in stages. During the molding process, the glass is required to flow on the mold wall surface at the beginning, and after a certain shape, for economic (and time) reasons, the glass is expected to set as quickly as possible. The force (gravity, pressure, tension, etc.) applied to the glass frit exceeds the molecular resistance inside the glass frit. Such as viscosity, surface tension, etc. will make the glass flow. The forming process is closely related to the continuous reduction of the heat content in the glass. The viscosity of glass is closely related to temperature, which is that glass's heat conduction and radiation become other important physical properties in the molding process.

3. If the heat radiation performance of glass is not considered at the same time. It is also impossible to make the glass meet its specified requirements according to its viscosity change. The relationship between the properties of the glass (viscosity and heat radiation) and the mechanical forming process of bottle glass is very close. For example, the edge portion of the green glass frit solidifies faster than the white glass frit. The latter is strongly heated by the interior of the glass due to its strong radiation transmission capacity during heavy heating.

4. Another property of glass that interferes is the tendency to crystallize. For example, in the feeder section, it is viewed from the direction in which the molten glass flows. The stagnation of the molten glass next to the flowing glass melt will cause crystallization at a certain temperature. These crystals (mostly needle-like or small rod-like) are brought to the product (in the wall of the bottle) during the forming process, especially Containers subject to internal pressure are prone to damage.

The above is the cause and classification of defects in the glass bottle cans introduced by the supplier of Round Jam Glass Jar. I hope to help you.